with a grain of salt [wið ə ɡrein ɔv sɔ:lt]

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附加级

adv. 有保留地，持怀疑态度

You should take what he says with a grain of salt. 你对他讲的话不可尽信。来自《简明英汉词典》
He can't take it with a grain of salt. 他办此事不能打折扣。来自《简明英汉词典》